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Lu, W.; MacFarlane, A.; Venuti, F.: Okapi-based XML indexing (2009)
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Robertson, S.E.: Overview of the Okapi projects (1997)
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Karamuftuoglu, M.: Designing language games in Okapi (1997)
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Keen, M.: ¬The Okapi projects (1997)
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Robertson, S.E.; Beaulieu, M.: Research and evaluation in information retrieval (1997)
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